The Banu Ghaniya
were an Almoravid
Sanhaja Berber dynasty.
Their first leader, Muhammad ibn Ali ibn Yusuf
, a son of Ali ibn Yusuf al-Massufi and the Almoravid Princess Ghaniya, was appointed as governor of the Balearic Islands
Following the collapse of the Almoravid power at the hand of the Almohads
in the 1140s, the Banu Ghaniya continued to govern the Balearic Islands
as independent emirs
until about 1203, with a brief interruption in the 1180s. Later leaders (Ali ibn Ishaq and Yahya) made a determined attempt to reconquer the Maghreb
(and in particular Ifriqiya
), taking Bougie
and conquering most of modern Tunisia
from about 1180 onwards.
They were influential in the downfall of the Almohad Empire in Eastern Maghrib.
In Tunisia Ali ibn Ishaq adhered to the Abbasid Caliphate
and was formally appointed by Al-Mustadi
with the title of "heir of the Almoravids".